Deducting Motorcycles

Two years ago, a man was offered a motorcycle for $1024, but he declined to buy it. A year later, he was offered the same motorcycle for $640, but again decided not to buy it. A little while after that, he was again offered the motorcycle, this time at $400. Again, he refused to buy it. Last week, he turned the motorcycle down even though the price had now fallen to $250. If the owner offers it for sale yet again, and he makes a consistent reduction, how much will it be for sale for the next time?